Suppose the Internet retailer Buy.com would like to investigate the relationship between the amount of time in
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Suppose the Internet retailer Buy.com would like to investigate the relationship between the amount of time in minutes a purchaser spends on its Web site and the amount of money he or she spends on an order. The following table shows the data from a random sample of 12 customers. These data can also be found in the Excel file Buy.com.xlsx.
Time Order Size ($) Time Order Size ($)
18 69 5 58 13 26 37 365 26 94 6 127 23 199 36 160 2 49 24 75 14 38 9 250
a. Calculate the Spearman rank-order correlation coefficient.
b. Using a = 0.05, perform a hypothesis test to determine if the population rank correlation coefficient is different than zero.
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